Is sign language international

No. American Sign Language (ASL) us used in the U.S. and parts of Canada. French speaking portions of Canada use Langue des Signes Québécoise (LSQ). British Sign Language (BLS) is not fully intelligable to users of American Sign Language despite the fact that England and the U.S. share the same spoken language. Some countries have more than one sign language. How many there are and their histories depend on how the community of users came together. There are however, a large number of common or similar signs among the European sign languages and their descendants. Deaf people are also very skilled at finding gestures that can easily bridge language barriers. So Deaf people from two different countries tend to be able to communicate more easily than two hearing people who do not speak each other's language.